#! /usr/bin/racket -f

(define (equation x)
     (= (+ 1 (* 2 x) (* x x)) 0)
     )  

(define (equation1 x) 
  (= (+ (* 4 x) 42) 62)
  )

(define (F-C t)
  (/ (* 5.0 (- t 32.0)) 9.0)
  )

(display (equation 1))
(display (equation -1))
(display "\n")
(display (equation1 10))
(display "\n")
(display (equation1 5))
(display "\n")
(display (F-C 100))
(display "\n")

